'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
    return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// 排除打包
// 排除掉element xlsx 和vue的打包
// const externals = {
//   'vue': 'Vue',
//   'element-ui': 'ELEMENT',
//   'xlsx': 'XLSX'
// }

// const cdn = {
//   css: [
//     // element-ui css
//     'https://unpkg.com/element-ui/lib/theme-chalk/index.css' // 样式表
//   ],
//   js: [
//     // vue must at first!
//     'https://unpkg.com/vue/dist/vue.js', // vuejs
//     // element-ui js
//     'https://unpkg.com/element-ui/lib/index.js', // elementUI
//     'https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/jszip.min.js',
//     'https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/xlsx.full.min.js'
//   ]
// }

// 因为开发阶段会载入env.development，生产阶段会载入env.production
// 通过取里面的变量就可以知道当前正在运行的是什么环境
const isProd = process.env.ENV === 'production'
let externals = {}
let cdn = { css: [], js: [] }
if (isProd) {
    externals = {
        'vue': 'Vue',
        'element-ui': 'ELEMENT',
        'xlsx': 'XLSX'
    }
    cdn = {
        css: [
            // element-ui css
            'https://unpkg.com/element-ui/lib/theme-chalk/index.css' // 样式表
        ],
        js: [
            // vue must at first!
            'https://unpkg.com/vue/dist/vue.js', // vuejs
            // element-ui js
            'https://unpkg.com/element-ui/lib/index.js', // elementUI
            'https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/jszip.min.js',
            'https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/xlsx.full.min.js'
        ]
    }
}

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
    /**
     * You will need to set publicPath if you plan to deploy your site under a sub path,
     * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
     * then publicPath should be set to "/bar/".
     * In most cases please use '/' !!!
     * Detail: https://cli.vuejs.org/config/#publicpath
     */
    publicPath: '/',
    outputDir: 'dist',
    assetsDir: 'static',
    lintOnSave: process.env.NODE_ENV === 'development',
    productionSourceMap: false,
    devServer: {
        port: port,
        open: true,
        overlay: {
            warnings: false,
            errors: true
        },
        // 开发服务器8080
        // 代理配置，凡是发现带有/api的连接
        // 记得转向远程
        proxy: {
            // key: value的方式指定，需要转发请求模式：配置对象
            '/api': {
                // 转发目标
                // 远程的
                // target: 'http://ihrm-java.itheima.net',
                // 本地的
                // target: 'http://localhost:3000',
                target: 'http://192.168.102.58:3000/',

                // 是否跨域，写死true
                changeOrigin: true
            }
        }
        // mock-serve会导致代理服务的异常
        // before: require('./mock/mock-server.js')
    },
    configureWebpack: {
        // provide the app's title in webpack's name field, so that
        // it can be accessed in index.html to inject the correct title.
        name: name,
        resolve: {
            alias: {
                '@': resolve('src')
            }
        },
        externals
    },
    chainWebpack(config) {
        // it can improve the speed of the first screen, it is recommended to turn on preload
        config.plugin('preload').tap(() => [{
                rel: 'preload',
                // to ignore runtime.js
                // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
                fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
                include: 'initial'
            },
            // 配置远程cdn的地址
            config.plugin('html').tap(args => {
                args[0].cdn = cdn
                return args
            })
        ])

        // when there are many pages, it will cause too many meaningless requests
        config.plugins.delete('prefetch')

        // set svg-sprite-loader
        config.module
            .rule('svg')
            .exclude.add(resolve('src/icons'))
            .end()
        config.module
            .rule('icons')
            .test(/\.svg$/)
            .include.add(resolve('src/icons'))
            .end()
            .use('svg-sprite-loader')
            .loader('svg-sprite-loader')
            .options({
                symbolId: 'icon-[name]'
            })
            .end()

        config
            .when(process.env.NODE_ENV !== 'development',
                config => {
                    config
                        .plugin('ScriptExtHtmlWebpackPlugin')
                        .after('html')
                        .use('script-ext-html-webpack-plugin', [{
                            // `runtime` must same as runtimeChunk name. default is `runtime`
                            inline: /runtime\..*\.js$/
                        }])
                        .end()
                    config
                        .optimization.splitChunks({
                            chunks: 'all',
                            cacheGroups: {
                                libs: {
                                    name: 'chunk-libs',
                                    test: /[\\/]node_modules[\\/]/,
                                    priority: 10,
                                    chunks: 'initial' // only package third parties that are initially dependent
                                },
                                elementUI: {
                                    name: 'chunk-elementUI', // split elementUI into a single package
                                    priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                                    test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                                },
                                commons: {
                                    name: 'chunk-commons',
                                    test: resolve('src/components'), // can customize your rules
                                    minChunks: 3, //  minimum common number
                                    priority: 5,
                                    reuseExistingChunk: true
                                }
                            }
                        })
                        // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
                    config.optimization.runtimeChunk('single')
                }
            )
    }
}